WTS/T: Hens Tooth Chris King 2-nut Headset 1" BMX/Vintage Schwinn Sizing

Odd bird here. A very nice, very complete Chris King 2-Nut headset pulled from a fillet brazed Schwinn Super Sport. The sizing is very odd, and matches the 1" BMX sizing from the Sheldon chart:

Image: https://s13.postimg.org/kmc2tblxz/Untitled.png

So the cups/headtube ID is a few mm...